Initial Android commit

addons/dialogic/Nodes/BackgroundMusic.gd

@@ -0,0 +1,62 @@
+extends Control
+class_name DialogicBackgroundMusic
+
+onready var _track1: = $Track1
+onready var _track2: = $Track2
+
+var current_path = ""
+var current_track = null
+
+func _ready():
+	$Tween.connect("tween_completed", self, "_on_Tween_tween_completed")
+
+func crossfade_to(path:String, audio_bus:String, volume:float, fade_length:float)->void :
+	
+	if _track1.playing and _track2.playing:
+		return 
+	
+	var stream:AudioStream = load(path)
+	var fade_out_track = _track1
+	var fade_in_track = _track2
+	
+	if _track2.playing:
+		fade_out_track = _track2
+		fade_in_track = _track1
+	
+	
+	fade_in_track.stream = stream
+	fade_in_track.bus = audio_bus
+	fade_in_track.volume_db = - 60
+	
+	
+	$Tween.interpolate_property(fade_out_track, "volume_db", null, - 60, fade_length, Tween.TRANS_EXPO)
+	$Tween.interpolate_property(fade_in_track, "volume_db", - 60, volume, fade_length, Tween.TRANS_EXPO)
+	$Tween.start()
+	
+	
+	if current_path == path:
+		fade_in_track.play(fade_out_track.get_playback_position())
+	
+	else :
+		fade_in_track.play()
+	current_track = fade_in_track
+	
+	current_path = path
+
+func fade_out(fade_length:float = 1)->void :
+	current_path = ""
+	current_track = null
+	$Tween.interpolate_property(_track1, "volume_db", null, - 60, fade_length, Tween.TRANS_EXPO)
+	$Tween.interpolate_property(_track2, "volume_db", null, - 60, fade_length, Tween.TRANS_EXPO)
+	$Tween.start()
+
+func _on_Tween_tween_completed(object, key):
+	
+	if object.volume_db == - 60:
+		object.playing = false
+		object.stream = null
+
+func get_current_info():
+	if current_track != null:
+		return {"file":current_path, "volume":current_track.volume_db, "audio_bus":current_track.bus}
+	return null